Mr. Seema taught mole concept to the students of class IX and asked the students to revise whatever had been taught. In the next period, she divided the class into several groups and asked each member of each group to explain what they have understood to the other members of their group.
Afreen a member of one of the group started to explain mole concept to the other members of her group as follow. Number of moles of molecules is equal to its mass and it is also equal to the Avogadro’s number.
Read the above passage and answer the following questions.
(i) Comment on Afreen’s understanding of mole concepts. What modification do her statement need?
(ii) What is the unit of Avogadro’s number?
(iii) What are the value displayed by Mrs. Seema?
(i) Number of moles is equal to the mass of an element divided by its molar mass. The number of particles (atoms, molecules, ions) present in 1 mole of substance is fixed with a value of 6.022 × 1023 atoms (Avogadro’s number)
(ii) The unit of Avogadro’s number depends upon the nature the nature of the substance. The unit of Avogadro’s number can be atoms. molecules or ions.
(iii) Mr. Seema is concern for students. She revises all the topics with students so that they can grab the topics easily. She is a very good teacher.